653 lines
18 KiB
C
653 lines
18 KiB
C
/*-
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* Copyright (c) 1997 by
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* David L. Nugent <davidn@blaze.net.au>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. This work was done expressly for inclusion into FreeBSD. Other use
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* is permitted provided this notation is included.
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* 4. Absolutely no warranty of function or purpose is made by the authors.
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* 5. Modifications may be freely made to this file providing the above
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* conditions are met.
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*
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* Display/change(+runprogram)/eval resource limits.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <ctype.h>
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#include <errno.h>
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#include <pwd.h>
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#include <login_cap.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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enum
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{
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SH_NONE,
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SH_SH, /* sh */
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SH_CSH, /* csh */
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SH_BASH, /* gnu bash */
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SH_TCSH, /* tcsh */
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SH_KSH, /* (pd)ksh */
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SH_ZSH, /* zsh */
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SH_RC, /* rc or es */
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SH_NUMBER
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};
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/* eval emitter for popular shells.
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* Why aren't there any standards here? Most shells support either
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* the csh 'limit' or sh 'ulimit' command, but each varies just
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* enough that they aren't very compatible from one to the other.
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*/
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static struct {
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const char * name; /* Name of shell */
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const char * inf; /* Name used for 'unlimited' resource */
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const char * cmd; /* Intro text */
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const char * hard; /* Hard limit text */
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const char * soft; /* Soft limit text */
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const char * both; /* Hard+Soft limit text */
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struct {
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const char * pfx;
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const char * sfx;
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int divisor;
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} lprm[RLIM_NLIMITS];
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} shellparm[] =
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{
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{ "", "infinity", "Resource limits%s%s:\n", "-max", "-cur", "",
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{
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{ " cputime%-4s %8s", " secs\n", 1 },
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{ " filesize%-4s %8s", " kb\n", 1024 },
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{ " datasize%-4s %8s", " kb\n", 1024 },
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{ " stacksize%-4s %8s", " kb\n", 1024 },
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{ " coredumpsize%-4s %8s", " kb\n", 1024 },
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{ " memoryuse%-4s %8s", " kb\n", 1024 },
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{ " memorylocked%-4s %8s", " kb\n", 1024 },
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{ " maxprocesses%-4s %8s", "\n", 1 },
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{ " openfiles%-4s %8s", "\n", 1 },
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{ " sbsize%-4s %8s", " bytes\n", 1 },
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{ " vmemoryuse%-4s %8s", " kb\n", 1024 }
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}
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},
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{ "sh", "unlimited", "", " -H", " -S", "",
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{
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{ "ulimit%s -t %s", ";\n", 1 },
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{ "ulimit%s -f %s", ";\n", 512 },
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{ "ulimit%s -d %s", ";\n", 1024 },
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{ "ulimit%s -s %s", ";\n", 1024 },
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{ "ulimit%s -c %s", ";\n", 512 },
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{ "ulimit%s -m %s", ";\n", 1024 },
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{ "ulimit%s -l %s", ";\n", 1024 },
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{ "ulimit%s -u %s", ";\n", 1 },
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{ "ulimit%s -n %s", ";\n", 1 },
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{ "ulimit%s -b %s", ";\n", 1 },
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{ "ulimit%s -v %s", ";\n", 1024 }
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}
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},
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{ "csh", "unlimited", "", " -h", "", NULL,
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{
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{ "limit%s cputime %s", ";\n", 1 },
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{ "limit%s filesize %s", ";\n", 1024 },
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{ "limit%s datasize %s", ";\n", 1024 },
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{ "limit%s stacksize %s", ";\n", 1024 },
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{ "limit%s coredumpsize %s", ";\n", 1024 },
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{ "limit%s memoryuse %s", ";\n", 1024 },
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{ "limit%s memorylocked %s", ";\n", 1024 },
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{ "limit%s maxproc %s", ";\n", 1 },
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{ "limit%s openfiles %s", ";\n", 1 },
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{ "limit%s sbsize %s", ";\n", 1 },
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{ "limit%s vmemoryuse %s", ";\n", 1024 }
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}
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},
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{ "bash|bash2", "unlimited", "", " -H", " -S", "",
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{
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{ "ulimit%s -t %s", ";\n", 1 },
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{ "ulimit%s -f %s", ";\n", 1024 },
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{ "ulimit%s -d %s", ";\n", 1024 },
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{ "ulimit%s -s %s", ";\n", 1024 },
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{ "ulimit%s -c %s", ";\n", 1024 },
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{ "ulimit%s -m %s", ";\n", 1024 },
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{ "ulimit%s -l %s", ";\n", 1024 },
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{ "ulimit%s -u %s", ";\n", 1 },
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{ "ulimit%s -n %s", ";\n", 1 },
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{ "ulimit%s -b %s", ";\n", 1 },
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{ "ulimit%s -v %s", ";\n", 1024 }
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}
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},
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{ "tcsh", "unlimited", "", " -h", "", NULL,
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{
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{ "limit%s cputime %s", ";\n", 1 },
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{ "limit%s filesize %s", ";\n", 1024 },
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{ "limit%s datasize %s", ";\n", 1024 },
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{ "limit%s stacksize %s", ";\n", 1024 },
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{ "limit%s coredumpsize %s", ";\n", 1024 },
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{ "limit%s memoryuse %s", ";\n", 1024 },
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{ "limit%s memorylocked %s", ";\n", 1024 },
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{ "limit%s maxproc %s", ";\n", 1 },
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{ "limit%s descriptors %s", ";\n", 1 },
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{ "limit%s sbsize %s", ";\n", 1 },
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{ "limit%s vmemoryuse %s", ";\n", 1024 }
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}
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},
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{ "ksh|pdksh", "unlimited", "", " -H", " -S", "",
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{
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{ "ulimit%s -t %s", ";\n", 1 },
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{ "ulimit%s -f %s", ";\n", 512 },
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{ "ulimit%s -d %s", ";\n", 1024 },
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{ "ulimit%s -s %s", ";\n", 1024 },
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{ "ulimit%s -c %s", ";\n", 512 },
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{ "ulimit%s -m %s", ";\n", 1024 },
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{ "ulimit%s -l %s", ";\n", 1024 },
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{ "ulimit%s -p %s", ";\n", 1 },
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{ "ulimit%s -n %s", ";\n", 1 },
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{ "ulimit%s -b %s", ";\n", 1 },
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{ "ulimit%s -v %s", ";\n", 1024 }
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}
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},
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{ "zsh", "unlimited", "", " -H", " -S", "",
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{
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{ "ulimit%s -t %s", ";\n", 1 },
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{ "ulimit%s -f %s", ";\n", 512 },
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{ "ulimit%s -d %s", ";\n", 1024 },
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{ "ulimit%s -s %s", ";\n", 1024 },
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{ "ulimit%s -c %s", ";\n", 512 },
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{ "ulimit%s -m %s", ";\n", 1024 },
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{ "ulimit%s -l %s", ";\n", 1024 },
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{ "ulimit%s -u %s", ";\n", 1 },
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{ "ulimit%s -n %s", ";\n", 1 },
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{ "ulimit%s -b %s", ";\n", 1 },
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{ "ulimit%s -v %s", ";\n", 1024 }
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}
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},
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{ "rc|es", "unlimited", "", " -h", "", NULL,
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{
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{ "limit%s cputime %s", ";\n", 1 },
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{ "limit%s filesize %s", ";\n", 1024 },
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{ "limit%s datasize %s", ";\n", 1024 },
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{ "limit%s stacksize %s", ";\n", 1024 },
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{ "limit%s coredumpsize %s", ";\n", 1024 },
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{ "limit%s memoryuse %s", ";\n", 1024 },
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{ "limit%s lockedmemory %s", ";\n", 1024 },
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{ "limit%s processes %s", ";\n", 1 },
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{ "limit%s descriptors %s", ";\n", 1 },
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{ "limit%s sbsize %s", ";\n", 1 },
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{ "limit%s vmemoryuse %s", ";\n", 1024 }
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}
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},
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{ NULL, NULL, NULL, NULL, NULL, NULL,
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{ }
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}
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};
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static struct {
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const char * cap;
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rlim_t (*func)(login_cap_t *, const char *, rlim_t, rlim_t);
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} resources[RLIM_NLIMITS] = {
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{ "cputime", login_getcaptime },
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{ "filesize", login_getcapsize },
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{ "datasize", login_getcapsize },
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{ "stacksize", login_getcapsize },
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{ "coredumpsize", login_getcapsize },
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{ "memoryuse", login_getcapsize },
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{ "memorylocked", login_getcapsize },
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{ "maxproc", login_getcapnum },
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{ "openfiles", login_getcapnum },
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{ "sbsize", login_getcapsize },
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{ "vmemoryuse", login_getcapsize }
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};
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/*
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* One letter for each resource levels.
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* NOTE: There is a dependancy on the corresponding
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* letter index being equal to the resource number.
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* If sys/resource.h defines are changed, this needs
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* to be modified accordingly!
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*/
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#define RCS_STRING "tfdscmlunbv"
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static rlim_t resource_num(int which, int ch, const char *str);
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static void usage(void);
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static int getshelltype(void);
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static void print_limit(rlim_t limit, unsigned divisor, const char *inf,
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const char *pfx, const char *sfx, const char *which);
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extern char **environ;
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static const char rcs_string[] = RCS_STRING;
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int
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main(int argc, char *argv[])
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{
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char *p, *cls = NULL;
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char *cleanenv[1];
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struct passwd * pwd = NULL;
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int rcswhich, shelltype;
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int i, num_limits = 0;
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int ch, doeval = 0, doall = 0;
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login_cap_t * lc = NULL;
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enum { ANY=0, SOFT=1, HARD=2, BOTH=3, DISPLAYONLY=4 } type = ANY;
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enum { RCSUNKNOWN=0, RCSSET=1, RCSSEL=2 } todo = RCSUNKNOWN;
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int which_limits[RLIM_NLIMITS];
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rlim_t set_limits[RLIM_NLIMITS];
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struct rlimit limits[RLIM_NLIMITS];
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/* init resource tables */
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for (i = 0; i < RLIM_NLIMITS; i++) {
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which_limits[i] = 0; /* Don't set/display any */
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set_limits[i] = RLIM_INFINITY;
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/* Get current resource values */
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getrlimit(i, &limits[i]);
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}
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optarg = NULL;
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while ((ch = getopt(argc, argv, ":EeC:U:BSHabc:d:f:l:m:n:s:t:u:v:")) != -1) {
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switch(ch) {
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case 'a':
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doall = 1;
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break;
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case 'E':
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environ = cleanenv;
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cleanenv[0] = NULL;
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break;
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case 'e':
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doeval = 1;
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break;
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case 'C':
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cls = optarg;
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break;
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case 'U':
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if ((pwd = getpwnam(optarg)) == NULL) {
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if (!isdigit(*optarg) ||
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(pwd = getpwuid(atoi(optarg))) == NULL) {
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warnx("invalid user `%s'", optarg);
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usage();
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}
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}
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break;
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case 'H':
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type = HARD;
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break;
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case 'S':
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type = SOFT;
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break;
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case 'B':
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type = SOFT|HARD;
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break;
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default:
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case ':': /* Without arg */
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if ((p = strchr(rcs_string, optopt)) != NULL) {
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int rcswhich1 = p - rcs_string;
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if (optarg && *optarg == '-') { /* 'arg' is actually a switch */
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--optind; /* back one arg, and make arg NULL */
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optarg = NULL;
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}
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todo = optarg == NULL ? RCSSEL : RCSSET;
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if (type == ANY)
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type = BOTH;
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which_limits[rcswhich1] = optarg ? type : DISPLAYONLY;
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set_limits[rcswhich1] = resource_num(rcswhich1, optopt, optarg);
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num_limits++;
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break;
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}
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/* FALLTHRU */
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case '?':
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usage();
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}
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optarg = NULL;
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}
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/* If user was specified, get class from that */
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if (pwd != NULL)
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lc = login_getpwclass(pwd);
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else if (cls != NULL && *cls != '\0') {
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lc = login_getclassbyname(cls, NULL);
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if (lc == NULL || strcmp(cls, lc->lc_class) != 0)
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fprintf(stderr, "login class '%s' non-existent, using %s\n",
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cls, lc?lc->lc_class:"current settings");
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}
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/* If we have a login class, update resource table from that */
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if (lc != NULL) {
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for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
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char str[40];
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rlim_t val;
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/* current value overridden by resourcename or resourcename-cur */
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sprintf(str, "%s-cur", resources[rcswhich].cap);
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val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_cur, limits[rcswhich].rlim_cur);
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limits[rcswhich].rlim_cur = resources[rcswhich].func(lc, str, val, val);
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/* maximum value overridden by resourcename or resourcename-max */
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sprintf(str, "%s-max", resources[rcswhich].cap);
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val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_max, limits[rcswhich].rlim_max);
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limits[rcswhich].rlim_max = resources[rcswhich].func(lc, str, val, val);
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}
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}
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/* now, let's determine what we wish to do with all this */
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argv += optind;
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/* If we're setting limits or doing an eval (ie. we're not just
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* displaying), then check that hard limits are not lower than
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* soft limits, and force rasing the hard limit if we need to if
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* we are raising the soft limit, or lower the soft limit if we
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* are lowering the hard limit.
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*/
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if ((*argv || doeval) && getuid() == 0) {
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for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
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if (limits[rcswhich].rlim_max != RLIM_INFINITY) {
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if (limits[rcswhich].rlim_cur == RLIM_INFINITY) {
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limits[rcswhich].rlim_max = RLIM_INFINITY;
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which_limits[rcswhich] |= HARD;
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} else if (limits[rcswhich].rlim_cur > limits[rcswhich].rlim_max) {
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if (which_limits[rcswhich] == SOFT) {
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limits[rcswhich].rlim_max = limits[rcswhich].rlim_cur;
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which_limits[rcswhich] |= HARD;
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} else if (which_limits[rcswhich] == HARD) {
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limits[rcswhich].rlim_cur = limits[rcswhich].rlim_max;
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which_limits[rcswhich] |= SOFT;
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} else {
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/* else.. if we're specifically setting both to
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* silly values, then let it error out.
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*/
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}
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}
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}
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}
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}
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/* See if we've overridden anything specific on the command line */
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if (num_limits && todo == RCSSET) {
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for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
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if (which_limits[rcswhich] & HARD)
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limits[rcswhich].rlim_max = set_limits[rcswhich];
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if (which_limits[rcswhich] & SOFT)
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limits[rcswhich].rlim_cur = set_limits[rcswhich];
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}
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}
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/* If *argv is not NULL, then we are being asked to
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* (perhaps) set environment variables and run a program
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*/
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if (*argv) {
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if (doeval) {
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warnx("-e cannot be used with `cmd' option");
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usage();
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}
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login_close(lc);
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/* set leading environment variables, like eval(1) */
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while (*argv && (p = strchr(*argv, '=')))
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(void)setenv(*argv++, ++p, 1);
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/* Set limits */
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for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
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if (doall || num_limits == 0 || which_limits[rcswhich] != 0)
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if (setrlimit(rcswhich, &limits[rcswhich]) == -1)
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err(1, "setrlimit %s", resources[rcswhich].cap);
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}
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if (*argv == NULL)
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usage();
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execvp(*argv, argv);
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err(1, "%s", *argv);
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}
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shelltype = doeval ? getshelltype() : SH_NONE;
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if (type == ANY) /* Default to soft limits */
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type = SOFT;
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/* Display limits */
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printf(shellparm[shelltype].cmd,
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lc ? " for class " : " (current)",
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lc ? lc->lc_class : "");
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for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
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if (doall || num_limits == 0 || which_limits[rcswhich] != 0) {
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if (which_limits[rcswhich] == ANY || which_limits[rcswhich])
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which_limits[rcswhich] = type;
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if (shellparm[shelltype].lprm[rcswhich].pfx) {
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if (shellparm[shelltype].both && limits[rcswhich].rlim_cur == limits[rcswhich].rlim_max) {
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print_limit(limits[rcswhich].rlim_max,
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shellparm[shelltype].lprm[rcswhich].divisor,
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shellparm[shelltype].inf,
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shellparm[shelltype].lprm[rcswhich].pfx,
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shellparm[shelltype].lprm[rcswhich].sfx,
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shellparm[shelltype].both);
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} else {
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if (which_limits[rcswhich] & HARD) {
|
|
print_limit(limits[rcswhich].rlim_max,
|
|
shellparm[shelltype].lprm[rcswhich].divisor,
|
|
shellparm[shelltype].inf,
|
|
shellparm[shelltype].lprm[rcswhich].pfx,
|
|
shellparm[shelltype].lprm[rcswhich].sfx,
|
|
shellparm[shelltype].hard);
|
|
}
|
|
if (which_limits[rcswhich] & SOFT) {
|
|
print_limit(limits[rcswhich].rlim_cur,
|
|
shellparm[shelltype].lprm[rcswhich].divisor,
|
|
shellparm[shelltype].inf,
|
|
shellparm[shelltype].lprm[rcswhich].pfx,
|
|
shellparm[shelltype].lprm[rcswhich].sfx,
|
|
shellparm[shelltype].soft);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
login_close(lc);
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuv [val]] [[name=val ...] cmd]\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static void
|
|
print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which)
|
|
{
|
|
char numbr[64];
|
|
|
|
if (limit == RLIM_INFINITY)
|
|
strcpy(numbr, inf);
|
|
else
|
|
sprintf(numbr, "%jd", (intmax_t)((limit + divisor/2) / divisor));
|
|
printf(pfx, which, numbr);
|
|
printf(sfx, which);
|
|
|
|
}
|
|
|
|
|
|
static rlim_t
|
|
resource_num(int which, int ch, const char *str)
|
|
{
|
|
rlim_t res = RLIM_INFINITY;
|
|
|
|
if (str != NULL &&
|
|
!(strcasecmp(str, "inf") == 0 ||
|
|
strcasecmp(str, "infinity") == 0 ||
|
|
strcasecmp(str, "unlimit") == 0 ||
|
|
strcasecmp(str, "unlimited") == 0)) {
|
|
const char * s = str;
|
|
char *e;
|
|
|
|
switch (which) {
|
|
case RLIMIT_CPU: /* time values */
|
|
errno = 0;
|
|
res = 0;
|
|
while (*s) {
|
|
rlim_t tim = strtoq(s, &e, 0);
|
|
if (e == NULL || e == s || errno)
|
|
break;
|
|
switch (*e++) {
|
|
case 0: /* end of string */
|
|
e--;
|
|
default:
|
|
case 's': case 'S': /* seconds */
|
|
break;
|
|
case 'm': case 'M': /* minutes */
|
|
tim *= 60L;
|
|
break;
|
|
case 'h': case 'H': /* hours */
|
|
tim *= (60L * 60L);
|
|
break;
|
|
case 'd': case 'D': /* days */
|
|
tim *= (60L * 60L * 24L);
|
|
break;
|
|
case 'w': case 'W': /* weeks */
|
|
tim *= (60L * 60L * 24L * 7L);
|
|
case 'y': case 'Y': /* Years */
|
|
tim *= (60L * 60L * 24L * 365L);
|
|
}
|
|
s = e;
|
|
res += tim;
|
|
}
|
|
break;
|
|
case RLIMIT_FSIZE: /* Size values */
|
|
case RLIMIT_DATA:
|
|
case RLIMIT_STACK:
|
|
case RLIMIT_CORE:
|
|
case RLIMIT_RSS:
|
|
case RLIMIT_MEMLOCK:
|
|
case RLIMIT_VMEM:
|
|
errno = 0;
|
|
res = 0;
|
|
while (*s) {
|
|
rlim_t mult, tim = strtoq(s, &e, 0);
|
|
if (e == NULL || e == s || errno)
|
|
break;
|
|
switch (*e++) {
|
|
case 0: /* end of string */
|
|
e--;
|
|
default:
|
|
mult = 1;
|
|
break;
|
|
case 'b': case 'B': /* 512-byte blocks */
|
|
mult = 512;
|
|
break;
|
|
case 'k': case 'K': /* 1024-byte Kilobytes */
|
|
mult = 1024;
|
|
break;
|
|
case 'm': case 'M': /* 1024-k kbytes */
|
|
mult = 1024 * 1024;
|
|
break;
|
|
case 'g': case 'G': /* 1Gbyte */
|
|
mult = 1024 * 1024 * 1024;
|
|
break;
|
|
case 't': case 'T': /* 1TBte */
|
|
mult = 1024LL * 1024LL * 1024LL * 1024LL;
|
|
break;
|
|
}
|
|
s = e;
|
|
res += (tim * mult);
|
|
}
|
|
break;
|
|
case RLIMIT_NPROC:
|
|
case RLIMIT_NOFILE:
|
|
res = strtoq(s, &e, 0);
|
|
s = e;
|
|
break;
|
|
}
|
|
if (*s) {
|
|
warnx("invalid value -%c `%s'", ch, str);
|
|
usage();
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
static int
|
|
getshellbyname(const char * shell)
|
|
{
|
|
int i;
|
|
const char * q;
|
|
const char * p = strrchr(shell, '/');
|
|
|
|
p = p ? p+1 : shell;
|
|
for (i = 0; (q = shellparm[i].name) != NULL; i++) {
|
|
while (*q) {
|
|
int j = strcspn(q, "|");
|
|
|
|
if (j == 0)
|
|
break;
|
|
if (strncmp(p, q, j) == 0)
|
|
return i;
|
|
if (*(q += j))
|
|
++q;
|
|
}
|
|
}
|
|
return SH_SH;
|
|
}
|
|
|
|
|
|
/*
|
|
* Determine the type of shell our parent process is
|
|
* This is quite tricky, not 100% reliable and probably
|
|
* not nearly as thorough as it should be. Basically, this
|
|
* is a "best guess" only, but hopefully will work in
|
|
* most cases.
|
|
*/
|
|
|
|
static int
|
|
getshelltype(void)
|
|
{
|
|
pid_t ppid = getppid();
|
|
|
|
if (ppid != 1) {
|
|
FILE * fp;
|
|
struct stat st;
|
|
char procdir[MAXPATHLEN], buf[128];
|
|
int l = sprintf(procdir, "/proc/%ld/", (long)ppid);
|
|
char * shell = getenv("SHELL");
|
|
|
|
if (shell != NULL && stat(shell, &st) != -1) {
|
|
struct stat st1;
|
|
|
|
strcpy(procdir+l, "file");
|
|
/* $SHELL is actual shell? */
|
|
if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0)
|
|
return getshellbyname(shell);
|
|
}
|
|
strcpy(procdir+l, "status");
|
|
if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) {
|
|
char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t");
|
|
fclose(fp);
|
|
if (p != NULL)
|
|
return getshellbyname(p);
|
|
}
|
|
}
|
|
return SH_SH;
|
|
}
|
|
|